Spam that is mistaken for legitimate email.
Legitimate email messages that are mistaken as spam.
See pharming .
A type of computer virus that attaches itself to a program file. It executes when the file is run.
A three-character suffix that is part of a computer file name (for example, .jpg and .doc ). Common to files on a PC.
A device or program that blocks outsiders from accessing a computer connected to the Internet. Some firewalls also monitor data traffic outbound from a computer or network.
Programming stored on a chip inside a device (such as a network router) that controls it.
Software offered to the public free.